Assessing the Effectiveness of NSA Eavesdropping

The Washington Post's Barton Gellman talks to Robert Siegel about what is known about the effectiveness of warrantless eavesdropping in identifying terror suspects in the United States.

Gellman says that although the National Security Agency has monitored international calls and e-mail of thousands of people in the United States, only in less than 10 cases has the administration then pursued a warrant to continue spying on a suspect by monitoring his or her domestic calls. Gellman says that raises questions about the program's efficiency.

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